Final answer:
The Lincoln-Douglas debates resulted in a raised national profile for Abraham Lincoln, highlighted the differences between Democrats and Republicans, and led to Lincoln's victory in the 1860 Presidential election.
Step-by-step explanation:
The long-term results of the Lincoln-Douglas debates had a significant impact on the political landscape of the United States. While Douglas managed to retain his seat in the Senate, the debates greatly raised Abraham Lincoln's national profile and catapulted him into the national spotlight. The debates highlighted the differences between Democrats and Republicans in the North and set the stage for the presidential election of 1860, in which Lincoln successfully defeated Douglas and became the 16th President of the United States.